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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

32575 results found.

  1. GRB 070311: Optical Brightening
  2. GRB 070306: possible emission-line redshift
  3. GRB 070311: SARA upper limit
  4. GRB 070309: variability of the XRT afterglow candidate
  5. GRB 070311: MDM Optical Follow-up
  6. GRB 070311: RAPTOR Detection of Optical Emission
  7. GRB070311: FRAM early follow-up limit
  8. GRB 070311: P60 Observations
  9. GRB 070311: MDM Optical Detection
  10. GRB 070311: Swift/UVOT Upper Limits
  11. GRB 070311: MITSuME Okayama Optical Observation
  12. GRB 070311: Swift-XRT refined analysis
  13. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  14. GRB 070311: REM candidate afterglow
  15. GRB060901: Candidate optical afterglow
  16. GRB070309: Swift/XRT possible afterglow detection
  17. GRB 070125: Chandra X-ray Confirmation of Jet Break
  18. GRB 070309: Swift/UVOT Upper Limits
  19. GRB 070306, optical observation
  20. Swift UVOT Finding Charts for GRB 070309
  21. GRB 070125: X-ray light curve analysis
  22. VLA observation of GRB 070306
  23. GRB 070306: NOT observations
  24. GRB 070306 Swift/UVOT refined analysis
  25. GRB070306: confirmation of near infrared afterglow
  26. GRB 070306: ART-3 early optical and near infrared constraints
  27. GRB 070306, Swift-BAT refined analysis
  28. GRB 070306: XRT Team Refined Analysis
  29. GRB 070306: Optical and IR observations with KANATA
  30. GRB 070223: NIR observations at WHT
  31. GRB070227: Swift-XRT refined analysis
  32. GRB 060605 new redshift
  33. GRB 070125, deep late-time optical observation
  34. VLA observation of GRB 070224
  35. GRB 070223: Optical Observations
  36. GRB 070227: optical observations
  37. GRB 070227: Swift/UVOT Upper Limits
  38. GRB 070227, Swift-BAT refined analysis
  39. GRB070227: possible X-ray afterglow detection
  40. GRB 070224: Optical afterglow confirmation
  41. GRB 070224: Swift/UVOT Upper Limits
  42. GRB070224: Swift-XRT Astrometrically Corrected Position
  43. VLA observation of GRB 070223
  44. VLA observation of GRB 070220
  45. GRB070224: Magellan Imaging Observations
  46. GRB 070224: WHT K-band imaging
  47. GRB 070224: MDM Observations
  48. GRB070224: Gemini Imaging Observations
  49. GRB070224: Swift-XRT Refined Analysis
  50. GRB 070224: optical afterglow candidate
  51. GRB 070224, Swift-BAT refined analysis
  52. GRB 070224: MASTER-Net refind analysis
  53. GRB 070224: MASTER-VWF-Kislovodsk observations
  54. GRB 070223: Optical observations
  55. RHESSI Spectrum of GRB070220
  56. GRB070223: Swift/UVOT refined analysis
  57. GRB 070223: Optical-IR observation with KANATA
  58. GRB 070223, Swift-BAT refined analysis
  59. GRB070223: MASTER-VWF-Kislovodsk observations
  60. GRB 070223: Swift-XRT Refined Analysis
  61. GRB070223 - SDSS Pre-Burst Observations
  62. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  63. GRB 070223: MDM Observations
  64. Konus-Wind and Konus-A observations of GRB 070220
  65. GRB 070220: MITSuME Okayama Optical Observation
  66. GRB 070220: ART-3 Optical and NIR limits
  67. GRB 070220 Swift-BAT Refined Analysis
  68. Swift/UVOT refined analysis of GRB070220
  69. GRB 070209: Swift XRT refined analysis
  70. GRB 070220: Swift-XRT Refined Analysis
  71. GRB 070220: Observation with the KANATA 1.5m telescope
  72. GRB 070219: Gemini Observations
  73. GRB 070220 : Faulkes Telescope North optical limit
  74. GRB070219: MASTER-VWF-Kislovodsk observations
  75. GRB 070219: XRT Refined Analysis
  76. GRB 070219: Swift/UVOT Upper limits
  77. GRB 070219: I-band observations
  78. GRB 070219, Swift-BAT refined analysis
  79. GRB 070219: optical TNG observations
  80. GRB 070219: Liverpool Telescope Observations
  81. GRB 070219: ROTSE-III Optical Limits
  82. IPN triangulation of GRB070201 (refined error box using MESSENGER data)
  83. GRB 070125 observations with the GMRT
  84. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  85. GRB 060927: PROMPT Observations
  86. GRB 070201: Correction to GCN 6094
  87. GRB 070125: Break in Optical Decay
  88. GRB 070209: Swift XRT analysis
  89. GRB 070201: clarification on localization and Konus-Wind spectra
  90. GRB070208: optical observations
  91. GRB 070201: IPN constraints and nearby galaxies
  92. GRB 070201: Proximity of IPN annulus to M31
  93. GRB 070208: MARGE Optical Observations
  94. GRB 070209, Swift-BAT refined analysis of the short hard burst
  95. GRB 070208: Swift XRT refined analysis
  96. GRB 070208: RAPTOR detection of early afterglow onset
  97. GRB070208: Absorption and emission redshift from Gemini
  98. GRB 070208: MDM Optical Decay
  99. GRB 070208, Swift-BAT refined analysis
  100. GRB070208 - SDSS Pre-Burst Observations

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